Air compressor



March 18, 1930. J. J. DILKS, JR 1,751,449

AIR COMPRESSOR Filed June 1928 2 Sheets-Sheet 2 WITNESSES INVLINTOR:

. mes JDzZ/fs, Jr,

BY @1 H W TTORNEYS.

Patented Mar. 18, 1930 FFEQE JAMES J. DILKS, JR., 013 WEST COLLINGSWOOD, NEW JERSEY, ASSIGNOB TO THE NEW- MATIX EQUIPMENT 00., OF AUDUBON, NEW JERSEY, A CORPORATION OF NEW JERSEY AIR COMPRESSOR Application filed lane 6, 1928. Serial No. 288,148.

' ment of the rubber in the tires inflated with the air.

My invention is in part directed toward overcoming the objection to which attention has just been directed, through provision of :3, novel scheme of lubrication whereby adeheat uate protection of all the moving arts of t e com ressor is assured with avoi ance of excess lu ricant likely to find its way past the compressor pistons. I

In connection with compressors of the type referred to I also aim to eflectivel provide against influx of dirt with the air t en in for compression; and, in general, to secure the advantages inherent to simplified construction and operation.

Still other objects and attendant advantages will be manifest from the detailed description hereinafter when taken in connection with the accompanying drawings ;whereof, Fig. I is partly a front elevation and partly an axial section of an air compressor conveniently embodying my invention.

Fig. I is an end view of the structure with ortions broken away and in section to expose Important details.

Fig. 111 is a perspective view of one of the parts associated with the crank caseof the compressor; and,

Fi IV is a detail section taken as indicate by the arrows IV-lV in Fig. I.

As delineated in these illustrations, my improved air compressor comprises a. 'multi cylinder block afi'ording, in the present instance two cylinders 11, with encompassing dissipating fins 12. As shown, the cylinderblock 10 is integral with a crank 13 which is substantially rectangular in configuration and mounted upon a pedestal or base 14. From Fig. I it will be observed that the end walls of the crank case 13 have aligned openings 15 permitting endwise in sertion of the one piece crank-shaft 16 with crank ofisets 180 degrees apart, said shaft being rotatively supported in outboard roller bearings 17, 17 a secured by bolts 18 over the openings 15. At one end, the shaft 16 carries a fi wheel 19 with angularly pitched vane spo cs 19 through the action of which coolmg air is continuously directed against the cylinders 11. Within thecylinders 11, reciprocate pistons 20, which are connected by means of pitmen 21, with the crank offsets of the shaft 16, as shown in Fig. I. in its top, each piston 20 has an axial airflow port 22 governed by a disk valve 23 which is responsive to suction, that is to say, capable of opening automatically as the piston 20 descends and of remaining closed during the up or pressure stroke of said piston. A separable head 25 secured to the c linder block 10 by bolts 26, has downwar cylindric bores 27 coaxial with the cylinders 11 to vertically guide pressure responsive valve balls ,28. These balls 28 cooperate with beveled seats 29 around outlet orifices 30 of the cylinders 11. The bores 27 are closed by removable screw caps 31 which also serve as sto s to limit the free up and down lay of the alls 28. A transverse duct 32 in te head 25 connects the two valve bores 27 and constitutes a common flow outlet for the air; while an elbow fitting 33 tapped into said duct in turn affords connection for a compressed air delivery pipe 34. The air to be compressed is drawn into the crank case 13 under piston suction through an elbow inlet 35 which afiords a passage 36 in continuation of a port 37 in one end wall of the crank case 13, see Fi II. The inlet elbow 35 is preferably ma a separable to permit insertion of a screen 38 between it and the crank case wall over the port 37, screws 39 being employed as a convenient securing means. A removable cover guard member, in the form of a screw attached plate 40 with a depending edge lip 41, overlies the mouth of the inlet 35, sald lip 41 overlapping the fitting but with provision of a narrow perimetric influx opening 42 for the air. By virtue of this construction, a tortuous passage is provided to guard against free carriage of dust or dirt into the 'compressor, any particles escaping the bafliin action of the guard cover being restraine by the screen 38 and collectedin the elbow fitting 35. Accumulationsof dirt may be readily extracted from time to time simply by removing the cover 40.

From Fig. I it will be noted that the crank case 13 opens at the bottom directly into the base or pedestal 14, and that the latter is made hollow with a horizontal diaphragm 44 setting apart therein a reservoir or sump 45 for oil to lubricate the workin parts of the compressor. This sump 45 is ept filled with oil to the level indicated in Fig. I, a sight gage 46 being provided as an aid to this end.

Secured by screws to the end wall of the crank case 13 opposite that occupied by the air inlet fitting 35 is a plate 47 which is detailed in Fig. III. This plate 47 affords a horizontal manifold duct 48 which is common to a pair of oil discharging jet orifices 49 registering with openings 50 in the end wall of the crank case 13; substantially at the level of the crank-shaft 16, and in line with the crank pin connections of the pit- -men 21. The lubricant is drawn from the reservoir or sump 45 of the base 14, for discharge at the jet orifices 49, by means ineluding-a rotary pump 51, see Figs. I, II and IV, whereof the rotor 52 is secured to that end of the crank-shaft 16 opposite the fly wheel 19. As shown, the rotor 52 revolves in the eccentric hollow 54 of a casing 53, secured by screws 56 to the endbearing 17 for the crank-shaft 16, and it is formed with a diametral slot which accommodates a pair of spring-ur 'ed sliding displacing vanes 55. The intake 5? of the rotary pump 51 is connected by a tube 58 with the sump 45 of the base 14, near the bottom, as shown in Fig. II; while its delivery outlet 59 is connected by a tube 60 with the duct 48 of the orifice plate 47.

The operation of the compressor is as follows: As the pistons 20 descend alternately, the valve disks 23 will obviously respond to suction, by virtue of the vacuum created above said pistons. Air thus entering the tops of the cylinders 11 through-the ports 22 in the pistons 20, will, during the succeeding up-strokes' of the latter, be com-' pressed; the disks 23 of course remaining closed during this phase of piston action. The successive charges of air so compressed are expelled through the valve ports 30, past the balls 28, into the delivery pipe 34, by way of the flow passage 32 in the .cylinder head 25. Concurrently with its entry into he crank case 13 through the inlet fit i g 35, bafiiing and screening of the air takes place in the manner already understood to remove foreign matter therefrom. By operation of the rotary pump 51, oil is drawn from the reservoir or sump 45' through the tube 58, and continuously delivered, via the connection 60 and the duct 48 of the orifice plate 47, for discharge through the inwardly directed jet orifices 49, the oil so discharged impinging upon the crank pin connections of the pitmen 21, as the shaft 16 revolves. In this way just sufiicient oil is supplied to insure adequate lubrication of the crank pin connections of the pitmen 21 as well as lubrication of the pistons 20, by oil thrown from the crank ofisets of the shaft 16 against the cylinder walls. In the intervals between periodic impingements, the oil from the jet orifices 49 pours back into the reservoir or sump 45 underlying the crank case .13. With such control of the lubrication, it will be apparent that I effectively avoid splashing of excess oil which would be likely to find its way past the pistons '20 into the-air delivery system.

Having thus described my invention, I claim:

1. In an air compressor of the character described, the combination of a cylinder with an integrally formed crank case supported by a hollow base embodying a communicating sump, a crank shaft, said crank case having aligned openings in opposite side walls permitting endwise insertion of the crank shaft, a piston reciprocating in the cylinder, a pitman connecting the piston with the crank shaft, and separate self contained outboard roller bearings for the ends of the crankshaft closing the side openings of the crank case.

2. In an air compressor of the character described, the combination of a cylinder, a pressure responsive discharge valve in the cyl inder head, a piston reciprocating in the cylinder, said piston having an air flow port, a suction responsive valve governing said port, a crank shaft, a pitman connecting the piston with the crank shaft, a crank case with an air inlet, and a guard cover member affording a lip to overlap said air inlet with provision of a narrow peripheral interval for influx of the air into the compressor.

3. In an air compressor of the character described, the combination of a cylinder, 'a pressure responsive valve in the cylinder head, a piston reciprocating in the cylinder, said piston having an air flow ort, a suction responsive valve governing sai port, a crank shaft, a pitman'connecting the piston with the crank shaft, a crank casing, a downward elbowed air inlet opening laterally into said casing, and a bafile guard cover member having a depending lip to overlap the mouth of the inlet with provision of a narrow peripheral interval for influx of air into the compressor.

' 4. In an air ompressor of the character described, the combination of a cylinder, a pressure res onsive discharge valve in the cylinder hea a piston reciprocatin in the cylinder, said piston having an air ow'orifice, a suction responsive valve governing said orifice, a crank shaft, a pitman connecting the iston with the crank shaft, a crank case having a screened air intake port in one side, an elbowed inlet fitting forming an upward continuation of the intake port, and a hafle guard cover member having a lip to overlap the mouth of the elbow fitting with provision of a narrow peripheral interval for influx of air into the compressor. I

5. In an air compressor of the character described, the combination of a cylinder, a reciprocating piston, a crank shaft, a pitman connecting the piston with the crank shaft, and means for continuously discharging an inwardly directed jet of lubricant to im inge upon the crank pin connection of the pitman for transfer in partto the cylinder walls by splash action.

6. In an air compressorof the character described,-the combination of a multiplicilrlyi' of cylinders, reciprocating pistons, a cra shaft, pitmen connecting the several pistons with the crank shaft, and means for continuously discharging inwardly directed jets of lubricant to impinge u on the individual crank pin connections of t e pitman for transfepin part to the cylinder walls by splash ac 1011.

7. In an aircom ressor'of thecharacter described, the combination of a cylinder, a reciprocatin piston, a crank shaft, a pitman connecting t 0 piston with the crank shaft,

described, the combination of a multi licity of cylinders, reciprocating pistons t erein,

a crank shaft, pitmen connecting the several prstonswith t e crank shaft a crank case with an underlying sump for lubricant, a removable plate at one side of the crank case affording a manifold duct common to inwardly discharging jet orifices in line with the several crank pin connections of the pitmen, and a pump to draw lubricant from the sump for continuous delivery to the manifold duct aforesaid and inward discharge from its jet orlfices.

9. In an air compressor of the character described, the combination of a cylinder, a reciprocatinglpiston, a crank shaft, a pitman connecting t e piston with the crank shaft, a crank case connecting end bearin s for the shaft and an underl ing sump for ubricant, a plate member on t e crank case embodying 

